3) For a bit of advice, this is my rebuild of a 303 on a Dura Ace hub, if that helps whosatthewheel.com/2014/12/27/zipp-188-hub-and-a-firecrest-rebuild/
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if you can’t find the odd length, round up, as I did.
This contradicts the usual advice.
I certainly always round down. Slightly too short is mildly annoying, slightly too long is game-over-and-buy-some-new-spokes time.
@Brommers started
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This contradicts the usual advice.